iPOLL, from the Roper Center for Public Opinion Research, includes searchable public opinion poll data on thousands of topics ranging from the 1930s, when survey research was in its infancy, to the present. Its collection now includes over 22,000 datasets and adds hundreds more each year. In total, the archive contains responses from millions of individuals on a vast range of topics.
To cite in NoodleTools: Where is it? Database | What is it? Unpublished Paper of Data | URL is unstable, use database name